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arxiv: nucl-ex/9706001 · v1 · pith:MJXUYQ5Ynew · submitted 1997-06-04 · ⚛️ nucl-ex

Abundance of Delta Resonances in 58Ni+58Ni Collisions between 1 and 2 AGeV

FOPI Collaboration: B.Hong , N.Herrmann , J.L.Ritman , D.Best , A.Gobbi , K.D.Hildenbrand , M.Kirejczyk , Y.Leifels
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C.Pinkenburg W.Reisdorf D.Schuell U.Sodan G.S.Wang T.Wienold J.P.Alard V.Amouroux N.Bastid I.Belyaev G.Berek J.Biegansky A.Buta J.P.Coffin P.Crochet R.Dona P.Dupieux M.Eskef P.Fintz Z.Fodor L.Fraysse A.Genoux-Lubain G.Goebels G.Guillaume E.Haefele F.Jundt J.Kecskemeti M.Korolija R.Kotte C.Kuhn A.Lebedev I.Legrand C.Maazouzi V.Manko J.Moesner S.Mohren W.Neubert D.Pelte M.Petrovici P.Pras F.Rami C.Roy Z.Seres B.Sikora V.Simion K.Siwek-Wilczynska A.Somov L.Tizniti M.Trzaska M.A.Vasiliev P.Wagner D.Wohlfarth A.Zhilin
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keywords agevdeltapionsspectracollisionsdecaymomentumpion
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Charged pion spectra measured in 58Ni-58Ni collisions at 1.06, 1.45 and 1.93 AGeV are interpreted in terms of a thermal model including the decay of Delta resonances. The transverse momentum spectra of pions are well reproduced by adding the pions originating from the Delta-resonance decay to the component of thermal pions, deduced from the high transverse momentum part of the pion spectra. About 10 and 18% of the nucleons are excited to Delta states at freeze-out for beam energies of 1 and 2 AGeV, respectively.

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